The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

He doesn't have it. He's got SQUAT.
The Big Bang Theory Season 1, Episode 13

By the way, when I say "SQUAT,"
I mean "diddlySQUAT."
The Big Bang Theory Season 3, Episode 4

When they find out I've got SQUAT,
they're gonna cut me off.
The Big Bang Theory Season 3, Episode 4

this is as far
as I can SQUAT.
The Big Bang Theory Season 11, Episode 12

I wish I had SQUAT.
The Big Bang Theory Season 3, Episode 4